(10-09-2026, 12:11 AM)Torsten wrote: You are not allowed to view links. Register or Login to view.Underneath all four is a point I'd expect the letter to address: no cipher can recover more information from a ciphertext than the ciphertext contains.
Strictly, this is not correct. Ie. with a You are not allowed to view links. Register or Login to view. cipher the cyphertext contains zero information, yet the full message can be recovered (in this case, all the information is in the key).